The Two or More Races population is projected to be the fastest growing over the next 46 years (see Table 2), with its population expected to triple in size (an increase of 226 percent). This group is projected to increase from 8 million to 26 million between 2014 and 2060. Its share of the total population is projected to increase from 2.5 percent.

Right now, census data are distorting one of the most transformative population developments of the early 21st century. A sizable and growing number of young people come from families with one white and one minority parent, as more adults form families across racial and ethnic lines. By far the largest group among them have Hispanic and white European ancestry.

But you wouldn‚Äôt know that from the 2000 or 2010 Census results. While 2000 was the first to allow Americans to report a multiracial heritage, neither it nor the 2010 Census allowed people to check off both part Hispanic and part something else.

Why? The culprit is that the census examines race and ethnicity with two questions: first, race; and then Hispanic origins. This format was created in accordance with a 1997 Office of Management and Budget memorandum that defined the standards for collecting and classifying ethnic and racial data to which all federal agencies must adhere.

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As more Americans take advantage of genetic testing to pinpoint the makeup of their DNA, the technology is coming head to head with the country‚Äôs deep-rooted obsession with race and racial myths. This is perhaps no more true than for the growing number of self-identified European Americans who learn they are actually part African.

For those who are surprised by their genetic heritage, the new information can often set into motion a complicated recalibration of how they view their identity.

Nicole Persley, who grew up in Nokesville, Va., was stunned to learn that she is part African. Her youth could not have been whiter. In the 1970s and ‚Äô80s in her rural home town, she went to school with farmers‚Äô kids who listened to country music and sometimes made racist jokes. She was, as she recalls, ‚Äúbasically raised a Southern white girl.‚ÄĚ

But as a student at the University of Michigan: ‚ÄúMy roommate was black. My friends were black. I was dating a black man.‚ÄĚ And they saw something different in her facial features and hair.

…The test results can present an intriguing puzzle. When a significant amount of African DNA shows up in a presumably white person, ‚Äúthere‚Äôs usually a story ‚ÄĒ either a parent moved away or a grandparent died young,‚ÄĚ said Angela Trammel, an investigative genealogist in the Washington area. ‚ÄúUsually a story of mystery, disappearance ‚ÄĒ something.‚ÄĚ

For Persley, 46, the link turned out to be her grandfather, who had moved away from his native Georgia and started a new life passing as white in Michigan. He married a white woman, who bore Persley‚Äôs father…

Richard Alba, Distinguished Professor of SociologyGraduate Center, City University of New York

Activists hold signs during a news conference in front of the Supreme Court in 2015. (Getty Images)

Will the 2020 Census be accurate? A number of observers have been worrying about that question for several reasons. For instance, the Justice Department has been trying to insert a citizenship question on the census form; such a question could discourage many immigrants from completing the form. As a result, cities and regions with large numbers of immigrants could see their populations seriously undercounted, with troubling results for political representation, services and funding.

But there‚Äôs another reason to be worried, one that hasn‚Äôt gotten much attention. The Census Bureau just announced that its 2020 form will not fundamentally change the questions it uses to ask about ethnic and racial origins. This may seem like a minor technical issue ‚ÄĒ but it will have major real-world implications. If it does not incorporate already-tested improvements into these questions, the census will deliver a less accurate picture of the United States.

And as a result, census statistics will continue to roil the public discussion of diversity, by exaggerating white decline and the imminence of a majority-minority United States. Political figures and pundits who oppose immigration and diversity could exploit that, peddling an alarmist narrative that doesn‚Äôt fit with the long-standing reality of mixing between immigrant and established Americans….

Sickle cell anemia was first described in 1910 and was quickly labeled a ‚Äúblack‚ÄĚ disease. At a time when many people were preoccupied with an imagined racial hierarchy, with whites on top, the disease was cited as evidence that people of African descent were inferior. But what of white people who presented with sickle cell anemia?

Doctors twisted themselves into knots trying to explain those cases away. White sickle cell patients must have mixed backgrounds, they contended ‚ÄĒ a black forebear they didn‚Äôt know about perhaps, or one they didn‚Äôt want to mention. Or maybe white patients‚Äô symptoms didn‚Äôt stem from sickle cell anemia at all, but some other affliction. The bottom line was, the disease was ‚Äúblack,‚ÄĚ so by definition white people couldn‚Äôt get it.

Today, scientists understand the sickle cell trait as an adaptation to malaria, not evidence of inferiority. One copy of the sickle cell trait protects against malaria. Having two can cause severe anemia and even death. Scientists also know that the trait is common outside Africa across the ‚Äúmalaria belt‚ÄĚ ‚ÄĒ the Arabian Peninsula, India and parts of the Mediterranean Basin. And people historically considered white can, in fact, carry it. In the Greek town of Orchomenos, for example, the gene is more prevalent than it is among African-Americans.

We know all this, and yet the racialization of the disease, the idea that it occurs only in people of sub-Saharan African descent, persists. ‚ÄúWhen I talk to medical students, I get this all the time ‚ÄĒ ‚ÄėSickle cell is a black trait,‚Äô ‚ÄĚ Michael Yudell, chairman of the department of community health and prevention at the Dornsife School of Public Health at Drexel University, told me.

That‚Äôs worrisome for many reasons, he says, chief among them that it may result in subpar medical care for some patients. Case in point: California‚Äôs universal blood disorder screening program has identified thousands of nonblack children with the sickle cell trait and scores with the disease ‚ÄĒ patients who, had doctors stuck to received ‚Äúwisdom,‚ÄĚ might have been missed.

Professor Yudell belongs to a growing chorus of scholars and researchers who argue that in science at least, we need to push past the race concept and, where possible, scrap it entirely. Professor Yudell and others contend that instead of talking about race, we should talk about ancestry (which, unlike ‚Äúrace,‚ÄĚ refers to one‚Äôs genetic heritage, not innate qualities); or the specific gene variants that, like the sickle cell trait, affect disease risk; or environmental factors like poverty or diet that affect some groups more than others…